98 lines
1.8 KiB
Go
98 lines
1.8 KiB
Go
package flag
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import (
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"errors"
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"flag"
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"github.com/imdario/mergo"
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"github.com/micro/go-micro/config/source"
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"strings"
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"time"
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)
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type flagsrc struct {
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opts source.Options
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}
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func (fs *flagsrc) Read() (*source.ChangeSet, error) {
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if !flag.Parsed() {
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return nil, errors.New("flags not parsed")
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}
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var changes map[string]interface{}
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visitFn := func(f *flag.Flag) {
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n := strings.ToLower(f.Name)
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keys := strings.FieldsFunc(n, split)
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reverse(keys)
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tmp := make(map[string]interface{})
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for i, k := range keys {
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if i == 0 {
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tmp[k] = f.Value
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continue
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}
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tmp = map[string]interface{}{k: tmp}
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}
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mergo.Map(&changes, tmp) // need to sort error handling
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return
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}
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unset, ok := fs.opts.Context.Value(includeUnsetKey{}).(bool)
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if ok && unset {
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flag.VisitAll(visitFn)
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} else {
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flag.Visit(visitFn)
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}
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b, err := fs.opts.Encoder.Encode(changes)
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if err != nil {
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return nil, err
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}
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cs := &source.ChangeSet{
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Format: fs.opts.Encoder.String(),
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Data: b,
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Timestamp: time.Now(),
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Source: fs.String(),
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}
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cs.Checksum = cs.Sum()
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return cs, nil
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}
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func split(r rune) bool {
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return r == '-' || r == '_'
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}
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func reverse(ss []string) {
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for i := len(ss)/2 - 1; i >= 0; i-- {
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opp := len(ss) - 1 - i
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ss[i], ss[opp] = ss[opp], ss[i]
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}
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}
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func (fs *flagsrc) Watch() (source.Watcher, error) {
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return source.NewNoopWatcher()
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}
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func (fs *flagsrc) String() string {
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return "flag"
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}
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// NewSource returns a config source for integrating parsed flags.
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// Hyphens are delimiters for nesting, and all keys are lowercased.
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//
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// Example:
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// dbhost := flag.String("database-host", "localhost", "the db host name")
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//
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// {
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// "database": {
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// "host": "localhost"
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// }
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// }
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func NewSource(opts ...source.Option) source.Source {
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return &flagsrc{opts: source.NewOptions(opts...)}
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}
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